WO2004114680A1 - Luminance et separation des couleurs - Google Patents

Luminance et separation des couleurs Download PDF

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Publication number
WO2004114680A1
WO2004114680A1 PCT/IB2004/050925 IB2004050925W WO2004114680A1 WO 2004114680 A1 WO2004114680 A1 WO 2004114680A1 IB 2004050925 W IB2004050925 W IB 2004050925W WO 2004114680 A1 WO2004114680 A1 WO 2004114680A1
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WIPO (PCT)
Prior art keywords
pixel
sample
luminance
values
samples
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PCT/IB2004/050925
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English (en)
Inventor
Claus N. Cordes
Gerard De Haan
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Koninklijke Philips Electronics N.V.
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Application filed by Koninklijke Philips Electronics N.V. filed Critical Koninklijke Philips Electronics N.V.
Priority to JP2006516707A priority Critical patent/JP2007521725A/ja
Priority to US10/560,719 priority patent/US20060158567A1/en
Priority to EP04737000A priority patent/EP1639835A1/fr
Publication of WO2004114680A1 publication Critical patent/WO2004114680A1/fr

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N9/00—Details of colour television systems
    • H04N9/77—Circuits for processing the brightness signal and the chrominance signal relative to each other, e.g. adjusting the phase of the brightness signal relative to the colour signal, correcting differential gain or differential phase
    • H04N9/78—Circuits for processing the brightness signal and the chrominance signal relative to each other, e.g. adjusting the phase of the brightness signal relative to the colour signal, correcting differential gain or differential phase for separating the brightness signal or the chrominance signal from the colour television signal, e.g. using comb filter
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N9/00—Details of colour television systems
    • H04N9/64—Circuits for processing colour signals

Definitions

  • the invention relates to a luminance and color separation filter unit for extracting a luminance signal and two color signals from a composite color television signal, comprising a chrominance signal being modulated on a sub-carrier which is located in the high-frequency part of the frequency spectrum of the luminance signal.
  • the invention further relates to an image processing apparatus comprising:
  • - receiving means for receiving a composite color television signal, comprising a chrominance signal being modulated on a sub-carrier which is located in the high- frequency part of the frequency spectrum of a luminance signal;
  • a luminance and color separation filter unit for extracting the luminance signal and two color signals from the composite color television signal.
  • the invention further relates to a method of extracting a luminance signal and two color signals from a composite color television signal, comprising a chrominance signal being modulated on a sub-carrier which is located in the high-frequency part of the frequency spectrum of the luminance signal.
  • the invention further relates to a computer program product to be loaded by a computer arrangement, comprising instructions to extract a luminance signal and two color signals from a composite color television signal, comprising a chrominance signal being modulated on a sub-carrier which is located in the high-frequency part of the frequency spectrum of the luminance signal, the computer arrangement comprising processing means and a memory.
  • a first type of low-cost PAL and NTSC decoders use horizontal bandpass/notch filters for Y/C separation. See pages 428-433 in "Video demystified: a handbook for the digital engineer 3rd edition", by K. Jack. Eagle Rock: LLH Technical Publishing, 2001. ISBN 1-878707-56-6.
  • the notch filter in the luminance path suppresses most of the chrominance, but attenuates the high-frequency luminance as well.
  • the bandpass filter in the chrominance path passes the chrominance, but also passes the high- frequency luminance.
  • these decoders suffer from a loss of horizontal luminance resolution and strong cross-luminance and cross-color artifacts.
  • a second type, more advanced decoders aim at an improved Y/C separation by using so called comb- filters. See e.g. the article "Three-dimensional pre- and post-filtering for PAL TV signals", by D. Teichner, in IEEE Transactions in Consumer Electronics, Vol. 34 (1988), No. 1, pp. 205-227.
  • This type of decoders exploit the opposite sub-carrier phase of certain vertically or temporally adjacent samples to separate the luminance from the chrominance.
  • the basic principle can be explained by taking a composite PAL sample, F l that is encoded at an arbitrary phase ⁇ :
  • the filter unit comprises:
  • - acquisition means to acquire a first sample of the composite color television signal, corresponding to a first pixel and other samples of the composite color television signal, corresponding to other pixels in a neighborhood of the first pixel;
  • - correlation estimation means to estimate a first set of correlation values representing correlations between the first sample and the respective other samples, on basis of an initial separation of an approximation of the luminance signal from the composite color television signal;
  • - computing means to compute a third set of combined values by means of combining respective elements of the first set of correlation values and the second set of penalty values
  • - decoding means to determine at least one final value of a set of values comprising a final luminance value and two color values corresponding to the first pixel on basis of the first sample and the particular sample.
  • the selected decoding option i.e. the particular sample
  • the selected decoding option is only based on the correlation between the first sample and the particular sample.
  • an additional sample with a predetermined sub-carrier phase difference compared to the first sample.
  • the number of samples fulfilling that condition is relatively limited.
  • the actual correlation between the first sample and the particular sample is relatively small.
  • a more general approach is used by applying an extended set of candidate samples, i.e. decoding options. The selection of the most appropriate sample, i.e.
  • the particular sample is based on the correlation between the two first sample and the particular sample and based on a corresponding penalty value. Therefore, the first sample and the particular sample corresponding to a pixel within a predetermined spatial or temporal neighborhood of the pixel, corresponding to the first sample, are used as input for the two sample filter unit.
  • the underlying principle of the filter unit according to the invention is that comb- filtering is most desirable on samples that exhibit the highest correspondence, regardless of their exact spatial or temporal direction. That means that there is a trade-off between a strict phase requirement, e.g. 180° difference, and correlation.
  • a particular sample and the first sample might have non-opposite sub-carries phases, but a difference of sub-carries phases of e.g.170° . In that case the particular sample might be chosen because of its high correlation value, although the difference of sub-carries phases is 170° .
  • This approach offers a significant increase in decoding options, and thereby promises an increase in decoding quality.
  • the correlation estimation means is arranged to compute a first one of the correlation values by means of computing a difference between a first luminance value and a second luminance value, the first luminance value belonging to the first pixel and being represented by a first sample of the approximation of the luminance signal, the second luminance value belonging to a second one of the pixels in the neighborhood of the first pixel and being represented by a second sample of the approximation of the luminance signal.
  • chrominance values are applied to estimate the first one of the correlation values.
  • the approximation of the luminance signal is obtained by means of an initial Y/C separation being performed by an initial separation filter. This initial separation filter might be based on any known type of Y/C separation filter as discussed above, e.g. a horizontal band-pass/notch filters or a known comb- filter.
  • the penalty estimation means is arranged to compute a first one of the penalty values by means of computing a distance between the first pixel and a second one of the pixels in the neighborhood of the first pixel.
  • the distance between pixels is an appropriate measure to determine the appropriateness of the corresponding samples to be applied for Y/C separation. The bigger the temporal or spatial difference the less appropriate the sample.
  • the penalty estimation means is arranged to compute a first one of the penalty values by means of:
  • the predetermined value corresponds to 180° .
  • the-j-redetermined value corresponds to 120° .
  • the decoding means are arranged to determine the final luminance value and the two color values corresponding to the first pixel on basis of the first sample, the particular sample and a further one of the other samples corresponding to other pixels in a neighborhood of the first pixel.
  • the deviation from the optimum sub-carrier phase is a relatively good measure to determine the appropriateness of the corresponding samples to be applied for Y/C separation. The computation of the deviation from the optimum sub-carrier phase is straightforward.
  • the other pixels in the neighborhood of the first pixel are located in a window which is centered around the first pixel and located in a first field to which the first pixel belongs.
  • a first portion of the other pixels in the neighborhood of the first pixel are located in a first window which is centered around the first pixel and located in a first field to which the first pixel belongs and a second portion of the other pixels in the neighborhood of the first pixel are located in a second window which is located in a second field.
  • the second window is centered around a central pixel.
  • a first option is that the first pixel and the central pixel have mutually equal coordinates.
  • a second option is that the first pixel and the central pixel are located along a motion trajectory.
  • the filter unit comprises: - acquisition means to acquire a first sample of the composite color television signal, corresponding to a first pixel and other samples of the composite color television signal, corresponding to other pixels in a neighborhood of the first pixel;
  • - correlation estimation means to estimate a first set of correlation values representing correlations between the first sample and the respective other samples, on basis of an initial separation of an approximation of the luminance signal from the composite color television signal;
  • - penalty estimation means to estimate a second set of penalty values representing relations between the first sample and the respective other samples
  • - computing means to compute a third set of combined values by means of combining respective elements of the first set of correlation values and the second set of penalty values
  • - decoding means to determine at least one final value of a set of values comprising a final luminance value and two color values corresponding to the first pixel on basis of the first sample and the particular sample.
  • the image processing apparatus comprises a display device for displaying images being represented by the luminance signal and the two color signals.
  • the image processing apparatus might be a TV.
  • This object of the invention is achieved in that the method comprises: - acquiring a first sample of the composite color television signal, corresponding to a first pixel and other samples of the composite color television signal, corresponding to other pixels in a neighborhood of the first pixel;
  • This object of the invention is achieved in that, the computer program product, after being loaded, provides said processing means with the capability to carry out:
  • Fig. 1 schematically shows a spectrum of a composite PAL video signal
  • Fig. 2 schematically show sub-carrier phases of samples in adjacent video lines for successive fields
  • Fig. 3 schematically shows an embodiment of a filter unit according to the invention
  • Fig. 4 schematically shows another embodiment of a filter unit according to the invention which is based on a three sample decoding scheme
  • Fig. 5 A schematically shows candidate windows in the next, current and previous fields at fixed position
  • Fig. 5B schematically shows candidate windows in the next, current and previous fields at motion compensated position
  • Fig. 6 schematically shows another embodiment of a filter unit according to the invention which is arranged to derive the luminance signal from decoded chrominance;
  • Fig. 7 schematically shows an image processing apparatus according to the invention.
  • Fig. 1 schematically shows a spectrum of a composite PAL video signal.
  • the chrominance components U and V are amplitude modulated in quadrature onto a sub-carrier frequency of 4.43MHz.
  • the resulting one-dimensional spectrum of the composite PAL video signal is illustrated in Fig. 1.
  • the sign of the V-component, the so-called V-switch is inverted every other line to reduce the influence of phase errors. More formally, the above is described in Equation 3, where x indicates the pixel position in a given field n , F sc the sub-carrier frequency and F the resulting composite
  • F ⁇ x, n) Y(x, n) + U(x, n) sin(2-TE.. t) ⁇ v(x, ⁇ ) cosi2 ⁇ Fj) (3)
  • a band-pass filter separates the high frequency components from the composite signal.
  • the pass-band of the band-pass filter contains mostly chrominance information, high-frequency luminance is present as well. Again, cross-talk will occur as the high-frequency luminance will be decoded as chrominance, resulting in the so-called cross-color artifacts.
  • the band-pass and notch filters can achieve perfect Y/C separation if the luminance and chrominance values of horizontally adjacent samples are identical, as here the frequency spectrum consists of a DC luminance component and a chrominance component at the sub-carrier frequency. However, if the correlation along the horizontal axis is insufficient, the frequency spectrum contains high-frequency luminance and/or chrominance components. The horizontal separation is now imperfect and results in cross-talk artifacts in the decoded signal.
  • comb-filters can be used to separate luminance and chrominance along the vertical or temporal axis. Their underlying principles are similar to those of the standard decoder, i.e. passing the desired frequency components and suppressing the undesired frequency components.
  • the luminance and chrominance are now modulated with harmonics of f h , i.e. the line frequency, and / fashion , i.e. the picture frequency.
  • this results in interleaved and non-overlapping luminance and chrominance frequency components in the direction where sufficient correlation is present.
  • the samples are highly correlated along the temporal axis, and as such, the luminance and chrominance components are interleaved and non-overlapping along that axis.
  • a filter with a comb-shaped amplitude response in that particular direction can therefore be used to separate the luminance and chrominance.
  • a typical comb-filter implementation uses two samples with an opposite relative phases, i.e. having a phase difference of 180° to separate luminance and chrominance. See Equations 1 and 2.
  • Fig. 2 schematically show sub-carrier phases of samples 202, 204, 208, 210, 214 and 216 in adjacent video lines 313, 1, 314, 2, 315 and 3 for successive fields 1A, IB, 2A, 2B, 3A, 3B and 4A.
  • the arrow equals the sub-carrier phase, e.g. pointing up denotes 0° and to the right denotes 90° .
  • pairs of samples 206, 212 and 218 are depicted which are used for standard comb-filters:
  • Fig. 3 schematically shows an embodiment of a filter unit 300 according to the invention.
  • Fig. 3 schematically shows a PAL decoder.
  • the filter unit 300 is provided with a composite color television signal CVBS, comprising a chrominance signal being modulated on a sub-carrier which is located in the high-frequency part of the frequency spectrum of the luminance signal.
  • the output of the filter unit 300 comprises a luminance signal Y , a first color signal U and a second color signal V .
  • the filter unit 300 comprises: - an acquisition unit 302 to acquire a first sample of the composite color television signal, corresponding to a first pixel and other samples of the composite color television signal, corresponding to other pixels in a neighborhood of the first pixel;
  • a correlation estimation unit 304 to estimate a first set of correlation values representing correlations between the first sample and the respective other samples, on basis of an initial separation of an approximation of the luminance signal from the composite color television signal;
  • a computing unit 308 to compute a third set of combined values by means of combining respective elements of the first set of correlation values and the second set of penalty values;
  • a selection unit 310 to select a particular sample of the composite color television signal on basis of the corresponding combined value compared to further combined values of the third set of combined values; - a decoding unit 312 to determine at least one final value of a set of values comprising a final luminance value and two color values corresponding to the first pixel on basis of the first sample and the particular sample.
  • This decoding unit might be any known type of PAL decoding filter, e.g. based on a comb-filter; and
  • the sample acquisition unit 302, the correlation estimation unit 304, penalty estimation unit 306, the computing unit 308, the selection unit 310, the decoding unit 312 and the initial separation filter 314 may be implemented using one processor. Normally, these functions are performed under control of a software program product. During execution, normally the software program product is loaded into a memory, like a RAM, and executed from there. The program may be loaded from a background memory, like a ROM, hard disk, or magnetically and/or optical storage, or may be loaded via a network like Internet. Optionally an application specific integrated circuit provides the disclosed functionality. Next the working of the filter unit 300 according to the invention will be explained. An important aspect of the filter unit 300 is the selection of related samples.
  • This selection is based upon characteristics of the composite color television signal CVBS. In this case the selection is performed on a per-sample basis. That means that for every first sample to be decoded, the most suitable additional sample, i.e. the particular sample is chosen.
  • the most suitable sample is determined by: - the correlation value, being computed by the correlation estimation unit 304, as insufficiently correlated samples yield decoding errors; and
  • the penalty is based on a phase measurement and optionally a distance measurement. Spatially and/or temporally adjacent samples are generally expected to have a higher correlation to the current sample than non-adjacent samples. As such, larger spatial and/or temporal distances should be avoided.
  • phase optionally distance and correlation information available, a straightforward approach is to apply the criteria to spatially and/or temporally adjacent samples: the so-called candidate set, which is generated by means of the acquisition unit 302.
  • the optimum sample or candidate being selected by means of the selection unit 310 within that candidate set serve as input to the decoding unit 312, thereby decoding the current CVBS sample.
  • determining the correlation between samples constitutes a chicken- or-the-egg problem: in order to decode the color television signal CVBS, one needs to know the correlation between samples, which in turn is only available after decoding.
  • the filtering is initialized by an initial separation, which is performed by the initial separation filter 314 which is based on e.g. a combination of horizontal band-pass/notch filters. Even though this initial separation is far from perfect, experimental validation has shown its suitability for this purpose.
  • the exact size of the candidate window is determined by the horizontal and vertical boundaries t-and t y , as shown in Equation 5. Again, (x, «) is the composite sample at the pixel position x in a given field n .
  • Equation 7 i.e. the complete candidate set CS equals the spatial candidate set C(x, ⁇ ) .
  • CS ⁇ c( , «) ⁇ (7)
  • CS might be composed of spatial as well as temporal candidates.
  • motion compensation is preferably used to increase the correlation of temporal candidates by positioning the candidate windows along the motion axis. This is illustrated in Equation 9 and Fig. 5B, where D(x,n) describes the displacement of the sample at pixel position x in a filed field n to field + l .
  • the displacement from field n to n - 1 is assumed to be - D(x, ) , i.e. linear movement.
  • Equation 10 ⁇ c( , «)c(j., « -l)c( ,7. - 2) ⁇
  • phase penalty the phase differences that result in no amplification of correlation noise should yield the lowest penalty.
  • the situation is simplified as strict phase requirements exist.
  • a two sample comb- filter requires an opposite relative phase, i.e. a difference of 180°, whereas in case of non- identical V-switches, comb-filtering using two samples is only possible if the samples' absolute phases are opposite.
  • the sub-carrier phase of F x is specified as ⁇ (F ) .
  • the normalized phase difference ⁇ n which transforms the relative phase ⁇ from [0,2 ⁇ ] is determined according to:
  • phase penalty for samples with non-identical V-switches is:
  • the optimum candidate i.e. the one with the lowest combined value, will be selected as the particular sample F 2 .
  • Both F x and F 2 can now be decoded by the two sample comb-filter kernel, i.e. the decoding unit 312.
  • the filter unit 300 comprises an up-sampling unit 316 which is designed to achieve an increased density of the sampling grid by means of interpolation.
  • an up-sampling unit 316 which is designed to achieve an increased density of the sampling grid by means of interpolation.
  • the filter unit 300 comprises an up-sampling unit 316 which is designed to achieve an increased density of the sampling grid by means of interpolation.
  • k times as many candidates are available in comparison to the original sampling grid, with k being the up-sampling factor. Therefore, the amount of candidates has increased, whereas a deterioration of correlation due to increased spatial distance has been avoided.
  • Fig. 4 schematically shows another embodiment of a filter unit according to the invention, which is based on a three sample decoding scheme.
  • the filter unit 400 is provided with a composite color television signal CVBS, comprising a chrominance signal being modulated on a sub-carrier which is located in the high-frequency part of the frequency spectrum of the luminance signal.
  • the output of the filter unit 400 comprises a luminance signal 7 , a first color signal U and a second color signal V .
  • the filter unit 400 comprises: - a sample acquisition unit 402 which is arranged to acquire a first F ⁇ , a second F 2 and a third F 3 sample from the received composite color television signal CVBS and to regenerate three signals , ⁇ and ⁇ corresponding to the sub-carrier used for encoding of the video data;
  • a division unit 412 for computing the luminance signal Y , the first color signal U and the second color signal V on basis of the intermediate signals Y n , U n , V n and E .
  • the filter unit 400 is arranged to compute an output luminance value of a particular output pixel, a first color value of the particular output pixel and a second color value of the particular output pixel on basis a first F x , a second F 2 and a third 3 sample derived from the composite color television signal CVBS, where the first, the second and the third sample have mutually different sub-carrier phases.
  • a received composite sample, Fix, introduces three unknown variables, namely the values of Y, U and V, and one known value, i.e. the locally regenerated sub- carrier phase ⁇ t .
  • Basic algebra shows that, given three linear equations, these three unknown variables can be solved. This means that three composite samples, encoded from Y, U and V values, can be used to separate the Y, U and V components exactly. However, in the situation that the composite samples were encoded from non-identical Y, U and V values, perfect separation is not possible and errors in the decoded values will occur.
  • V-switch of three composite samples Two situation with respect to the V-switch of three composite samples should be considered: - The V-switch of all three samples is identical; or
  • Equations 18 and 19 By solving these three linear equations for the Y, U and V components, the expressions in Equations 18 and 19 are obtained.
  • the Y, U and V components are expressed in terms of the three original composite samples and their corresponding sub-carrier phase.
  • V View - F 2 ⁇ sin (7) + F 3 ⁇ sin(j ⁇ ) - F 3 ⁇ sin( ⁇ )
  • V-switch of one composite sample is positive, whereas the remaining samples have a negative V-switch;
  • V-switch of one composite sample is negative, whereas the remaining samples have a positive V-switch.
  • Equation 20 The first situation is shown in Equation 20, whereas the second situation will not be covered, as it is identical except for an inversion in sign of the decoded V component.
  • Equation 21 and 22 Y + U ⁇ sin (7) + V ⁇ cos(7)
  • V n - F 2 ⁇ sin( ⁇ ) + F 3 ⁇ sin(o. ) - F 3 ⁇ sin( ⁇ )
  • phase penalty value is specified in Equation 25 for 0 ⁇ a ⁇ — , whereas the penalty for the other three quadrants, i.e. between
  • Fig. 6 schematically shows another embodiment of a filter unit according to the invention which is arranged to derive the luminance signal from decoded chrominance.
  • the filter unit 600 according to the invention comprises: - a first low pass filter 602 for filtering a first U one of the two color signals;
  • a modulator 606 connected to the first low pass filter 602 and the second low pass filter 604, for re-modulating the filtered first U ⁇ p one of the two color signals and the filtered second V ⁇ . one of the two color signals;
  • the first 602 and second low pass filter 604 have a characteristic which matches the low pass filters being applied in PAL encoders, i.e. 1.3MHz and the modulator 606 is arranged to modulate with a sub-carrier being applied in PAL encoders.
  • the two filtered color signals U LP and V u do not or hardly comprise frequency components which were not present in the original color signals before encoding.
  • the luminance signal also better matches the original luminance signal before encoding by a video encoding unit, i.e. a PAL encoder.
  • a further improvement of the filter unit according to the invention is based on dynamic window resizing.
  • Dynamic window resizing can achieve a reduction in computational cost and prevent decoding errors due to an erroneous initialization. In flat areas, i.e. in case of highly correlated samples, the candidate window size will be decreased to avoid any errors due to inaccuracies in the initialization. In areas with a significant amount of detail, an enlargement of the window size is necessary to ensure sufficient correlated candidates are available to the comb-filter.
  • Fig. 7 schematically shows an image processing apparatus 700 according to the invention, comprising:
  • Receiving means 302 for receiving a signal representing input images.
  • the filter unit 706 as described in connection with any of the Figs. 3, 4 and 6; and - A display device 704 for displaying images being represented by the luminance signal and the two color signals.
  • the signal may be a broadcast signal received via an antenna or cable but may also be a signal from a storage device like a VCR (Video Cassette Recorder) or Digital Versatile Disk (DVD).
  • the signal is provided at the input connector 710.
  • the image processing apparatus 700 might e.g. be a TV.
  • the image processing apparatus 704 does not comprise the optional display device but provides the output images to an apparatus that does comprise a display device 704.
  • the image processing apparatus 700 might be e.g. a VCR player.
  • the image processing apparatus 700 comprises storage means, like a hard-disk or means for storage on removable media, e.g. optical disks.

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  • Engineering & Computer Science (AREA)
  • Multimedia (AREA)
  • Signal Processing (AREA)
  • Processing Of Color Television Signals (AREA)

Abstract

Unité de filtrage de luminance et de séparation des couleurs (300) permettant d'extraire un signe de luminance (Y) et des signaux de deux couleurs (U, V) à partir d'un signal composite de télévision couleur (CVBS). L'unité de filtrage (300) comprend les éléments suivants: un moyen d'acquisition (302) pour effectuer l'acquisition d'un premier échantillon du signal composite de télévision couleur, correspondant à un premier pixel et d'autres échantillons, correspondant à d'autre pixels dans le voisinage du premier pixel; un moyen de calcul de corrélation (304) pour effectuer l'estimation d'un premier ensemble de valeurs de corrélation représentant des corrélations entre le premier échantillon et les autres échantillons respectifs; un moyen de calcul de pénalité (306) pour calculer un deuxième jeu de valeurs de pénalité représentant les rapports entre le premier échantillon et les autres échantillons respectifs; un moyen de calcul (308) pour calculer un troisième ensemble de valeurs combinées en combinant les éléments respectifs du premier et deuxième jeux; un moyen de sélection (310) pour sélectionner un échantillon particulier du signal composite de télévision couleur sur la base de la valeur combinée correspondante; et un moyen de décodage (312) pour déterminer une valeur de luminance et des valeurs de deux couleurs finales correspondant au premier pixel, sur la base du premier échantillon et de l'échantillon particulier.
PCT/IB2004/050925 2003-06-20 2004-06-17 Luminance et separation des couleurs WO2004114680A1 (fr)

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JP2006516707A JP2007521725A (ja) 2003-06-20 2004-06-17 輝度及び色分解
US10/560,719 US20060158567A1 (en) 2003-06-20 2004-06-17 Luminance and color separation
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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR100712506B1 (ko) * 2005-02-14 2007-04-27 삼성전자주식회사 크로스컬러 아티팩트 제거 회로 및 그 방법
CN100391265C (zh) * 2005-04-08 2008-05-28 杭州国芯科技有限公司 一种递归保护伪彩色抑制方法
WO2014005503A1 (fr) * 2012-07-02 2014-01-09 Mediatek Inc. Procédé et appareil pour calculer un candidat inter-vue dans un codage vidéo en 3d

Families Citing this family (6)

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Publication number Priority date Publication date Assignee Title
US8131103B2 (en) * 2005-09-30 2012-03-06 Koninklijke Philips Electronics N.V. Image detail enhancement
US8363734B2 (en) * 2008-01-12 2013-01-29 Huaya Microelectronics Multi-directional comb filtering in a digital video decoder
CN101500174B (zh) * 2008-01-29 2010-12-01 瑞昱半导体股份有限公司 动态选择亮度/色度分离的方法与相关装置
CN101729884B (zh) * 2008-10-16 2011-08-17 慧国(上海)软件科技有限公司 影像撷取装置与影像前处理方法
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CN107770472B (zh) * 2017-10-31 2020-07-28 中国电子科技集团公司第二十九研究所 一种secam制式模拟电视信号数字化解调方法及数字信号图像恢复方法

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5365281A (en) * 1992-06-26 1994-11-15 Samsung Electronics, Co., Ltd. Motion signal detecting circuit
US5585861A (en) * 1991-03-14 1996-12-17 Mitsubishi Denki Kabushiki Kaisha Luminance and chrominance signals separating filter adaptive to movement of image
WO2002060188A1 (fr) * 2001-01-24 2002-08-01 Asahi Kasei Kabushiki Kaisha Procede et circuit de separations de signaux y-c
US6504579B1 (en) * 1997-08-05 2003-01-07 Micronas Intermettal Gmbh Adaptive filter for processing video signals

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR940005178B1 (ko) * 1989-10-14 1994-06-11 미쯔비시 덴끼 가부시끼가이샤 움직임적응형 휘도신호 색신호 분리필터 및 그 분리방법
US5475445A (en) * 1990-04-03 1995-12-12 Mitsubishi Denki Kabushiki Kaisha Motion adaptive luminance signal and color signal separation filter
GB2247806B (en) * 1990-07-23 1994-11-09 Mitsubishi Electric Corp Brightness signal/color signal separating filter
KR0157480B1 (ko) * 1994-06-18 1998-11-16 김광호 화상처리에서 에지방향에 적응하는 휘도신호와 색신호 분리방법 및 회로
US5594508A (en) * 1994-11-07 1997-01-14 Tektronix, Inc. Decoder using adaptive non-separable digital filter
JPH09224260A (ja) * 1996-02-19 1997-08-26 Matsushita Electric Ind Co Ltd Ｙ／ｃ分離装置
US6384873B1 (en) * 1999-12-03 2002-05-07 Thomson Licensing S.A. Vector magnitude control of a comb filter

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5585861A (en) * 1991-03-14 1996-12-17 Mitsubishi Denki Kabushiki Kaisha Luminance and chrominance signals separating filter adaptive to movement of image
US5365281A (en) * 1992-06-26 1994-11-15 Samsung Electronics, Co., Ltd. Motion signal detecting circuit
US6504579B1 (en) * 1997-08-05 2003-01-07 Micronas Intermettal Gmbh Adaptive filter for processing video signals
WO2002060188A1 (fr) * 2001-01-24 2002-08-01 Asahi Kasei Kabushiki Kaisha Procede et circuit de separations de signaux y-c
EP1355501A1 (fr) * 2001-01-24 2003-10-22 Asahi Kasei Kabushiki Kaisha Procede et circuit de separations de signaux y-c

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR100712506B1 (ko) * 2005-02-14 2007-04-27 삼성전자주식회사 크로스컬러 아티팩트 제거 회로 및 그 방법
CN100391265C (zh) * 2005-04-08 2008-05-28 杭州国芯科技有限公司 一种递归保护伪彩色抑制方法
WO2014005503A1 (fr) * 2012-07-02 2014-01-09 Mediatek Inc. Procédé et appareil pour calculer un candidat inter-vue dans un codage vidéo en 3d
US10264281B2 (en) 2012-07-02 2019-04-16 Hfi Innovation Inc. Method and apparatus of inter-view candidate derivation in 3D video coding

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US20060158567A1 (en) 2006-07-20

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